Search results

Thank you. I will give this a try tomorrow and let you know.

Well, the pump was stopping before the anti cycle time elapsed. So my thought was that the heating water still needed to circulate rather than the pump keep stop starting as well ?.

Thanks Johntheo5, Flow temperature set at 62C. anti cycle time 20C, actual 6 mins. Boiler flow temperature at end of anti cycle 38C. Boiler then fires up and within seconds hits 67C and back into anti cycle. I have already increased pump over run time to keep circulating whilst in anti cycle...

After conversation with Vaillant technical who said my 424 ecoTEC plus has an output range of 12kW to 24kW the manual in fact says VU 246/6-5 OVZ (H-GB) 24kW Effective output range (P) at 50/30 °C 6.3 to 25.7 kW Effective output range (P) at 80/60 °C 6.1 to 24.6 kW 6.1kW still seems high. I...

Hi Johntheo5, Just called Valliant technical support and they tell me my boiler a 424 ecoTEC plus, modulates between 24Kw and 12Kw. Ie 12Kw is the lowest. That cant be correct can it ?????

Thank you also Johntheo5, I am glad to hear my interpretation of a overheat / anti cycle concern is more like the boiler sensor saying no heat required and going into anti cycle. I must admit that it has probably been doing this for some time. It looks to be a demand to minimum output setup as...

Point taken Madrab. Thank you for the ongoing advice which is appreciated. I most likely need a "pro" to come and check / set the system up as there looks to be an imbalance somewhere. I am doing some load calculations presently and that the downstairs rads equate to 10.18 Kw. The TRVs are...

Polished chrome valve caps for manual opening and closing of Drayton TRVs. Suitable for chrome towel rails and radiators. ( Screwfix )

Morning Madrab, thats my thinking as well. I have tried taking a couple of TRVs off and using the Drayton " manual" cap so effectively two more rads stay open with a trickle demand. Made some difference but not enough to stop the boiler from shutting down / anti cycle ?.

Thanks Madrab, Boiler goes to set temp of 62 and then pass to 67 and into anti cycle. Room stat has rads with lockshields, no TRVs. Anti cycle set at 25 mins but Vaillant graph shows in real time this equates to 6 mins ??

Thanks Notch 7. Something is clearly wrong and yes hopefully a pro can help.

Hi, I have a Vaillant ecoTEC plus 424 ( 24KW ) boiler feeding three circuits. Down stairs heating, upstairs heating and hot water via thermostats and motorized valves. There are twelve rads and two towel rails. All rads have TRVs except the one in the entrance hall. Both towel rails on...

Thanks Madrab, poor mains incoming water pressure unfortunately. New hot water , vented, cylinder installed last year with heating system upgrade. It seems just the cold is running out when in higher demand. I think doubling up as cross thread said is my best option.

Many thanks cross thread.

Thanks Iddy, mains water pressure is quite poor unfortunately.

Hi all, I have a very small cold water tank ( 118ltrs) in the loft of my four bedroom house. As there is only two of us we only recently found this out when the shower pump stopped whilst visiting family was using the shower. The loft is very shallow due to the dormer design of the house. The...

I bow to your superior knowledge in these things Johntheo5. My downstairs heating suffers from terrible TRV noise !. Upstairs far less. The new downstairs pipe runs are much shorter so flow rate will be higher ??. Can / should I try another setting on the pump and if so which. ( my...

Grundfos operating instructions for the UPS3 attached. Section 6 6.2.1 Refers to the factory setting of Constant curve or Constant speed 1,2 or 3. 6.2.2 * Proportional pressure mode is not recommended in heating systems that include an ABV. BUT, I also found this on their website ...

Grundfos UPS3 pump settings https://www.heatweb.co.uk/w/index.php?title=Grundfos_Pump_Settings#:~:text=The%20Grundfos%20pump%20has%203,LED%20and%204%20yellow%20LEDs.&text=When%20you%20switch%20on%20the,setting%20or%20the%20last%20setting.

Grundfos recommend the constant pressure setting for the UPS3 pump on central heating systems fitted with ABVs. Ie fixed speed 1,2 or 3. The pump does have a proportional pressure setting but as they state, only to be used on a system with no ABV. An option I am considering and Johntheo5 could...